Average Ocean Temperatures for New Jersey

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Average ocean temperatures along the New Jersey coast are listed below for each month in degrees Fahrenheit and degrees Celsius.

The Atlantic ocean off New Jersey gets quite chilly during winter. The water temperature averages just 35 °F (2 °C) in February at Atlantic City.

But come spring, the sea warms up rapidly. By summer, the ocean at New Jersey beaches is hot enough for an enjoyable swim. The temperature usually reaches 74 °F (23 °C) at Cape May in late July and early August.

By late spring, the Atlantic at Cape May in the south of the state has a substantial heat gain over places farther north. Until the end of September, Cape May's water stays a little warmer than the ocean at Atlantic City and Sandy Hook.

Average ocean temperature in °F
  Cape May Atlantic City Sandy Hook
January 37 37 37
February 37 35 36
March 42 42 40
April 50 48 46
May 59 56 55
June 68 63 62
July 73 70 69
August 74 73 72
September 72 70 68
October 61 61 59
November 52 53 51
December 42 44 43
Annual 55 54 53
Water temperature averages in °C
  Cape May Atlantic City Sandy Hook
January 3 3 3
February 3 2 2
March 6 6 4
April 10 9 8
May 15 13 13
June 20 17 16
July 23 21 21
August 23 23 22
September 22 21 20
October 16 16 15
November 11 12 11
December 6 7 6
Annual 13 12 12

These coastal water temperatures are averages compiled by the National Oceanographic Data Center. Actual ocean temperatures do vary from year to year depending upon the weather and the flow of ocean currents.

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